In the 1840s Manchester already had designs on becoming a port using the network of canals built in the 18th Century, this from 1844 ...
FIRST ARRIVAL IN THE PORT OF MANCHESTER OF A CARGO OF GOODS FOR BOND
We have great pleasure in recording the first arrival in the Port of Manchester of a vessel, with an entire cargo of wines and spirits removed in bond, and for bonding in Manchester. The vessel, a flat named the Express, was wholly laden with a valuable cargo of wines and spirits, in all about 40 tons weight, belonging to Mr. William Gibb, spirit merchant, of this town, whose active and long-continued exertions in the struggle to obtain the privilege of bonding for this great and important borough are about to be acknowledged in the form of a substantial mark of respect and gratitude by his fellow-townsmen. The Express arrived from Liverpool on Saturday evening; but it was yesterday morning before she began to unload. She is lying in the Bridgewater Canal, Knott Mill where the Duke's trustees have constructed a large bonding vault, which Mr. Gibb has taken and had licensed for the purpose, and we believe he is now removing his stock of wine and spirits from other ports to Manchester, for the greater convenience of sampling and sale. The lockers, gaugers, and other officers of Customs were in attendance, superintending the unloading of the vessel and thus have commenced the operations of the Manchester Custom-house. It is a gratifying circumstance that a gentleman who took so prominent a part in the struggle to obtain the boon of bonding for Manchester should be the first to enjoy the fruits of its success. We hope ere long to record the general operation of the system; though it will require a little time, perhaps, as it must have a beginning.
— Manchester Guardian
The ship was added to the CoA to simply represent trade and the city's desire to be seen as a port but this idea proved to be a bit of a failure at first with trade lost to the new railways and the canal needing several upgrades over the next 50 years to encourage cargo onto it. It was 1894 before the city became a successful port.